Grindmaster 115, 250 Loud grating noise, Rumbling noise, Chattering or buzzing noise, Activate

Troubleshooting Guide for Grind Selector™ Mechanism (Models 115AB and 250AB)

The following procedures must be performed by a qualified service technician.

PROBLEM	POSSIBLE CAUSE	SOLUTION
Loud grating noise.	• Burrs are touching each other on	• Readjust fine grind setting, see “To
	fine grind setting.	Adjust Fine Grind” section.
Rumbling noise.	• Thrust bearing rotating inside	• Replace thrust bearing and shear
	flange bearing.	cap.
Chattering or buzzing noise.	• Solenoid may have failed to seat	• Check alignment of solenoid and
	or close fully.	shift arm.
		• Also check the tightness of the
		solenoid mounting screws.
Loud vibration noise during	• Cotter pin in the thumb screw	• Attempt to spread flanges of cotter
grinding when Grind Selector™	linkage may be vibrating.	pin or replace cotter pin.
is not activated.
Grind Selector™ fails to	• Wiring harness loose.	• WITH MACHINE UNPLUGGED,
activate.		check wiring harness connections to
		see if they are secure on the timer
		terminals.
	• Solenoid has burned out.	• Replace solenoid.

If you still need help, call our Service Department at (800) 568-5715 (Monday through Friday 8am-6pm EST) or an authorized service center in your area. Please have the model and serial number ready so that accu- rate information can be given.

Prior authorization must be obtained from Grindmaster Corporation’s Technical Services Department for all warranty claims.

Page 9 115 & 250 Series Coffee Grinders